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xMax developed by xG Technology is a wireless communications technology whose developers claim is low power and provides a high data rate over a distance of about 13 miles.
A fundamental paradigm shift in the way radio signals are modulated and demodulated.
Developed by xG Technology in Florida Rather than transmitting many RF cycles for each bit of data to be sent, xMax does it in a single RF cycle.
Power is saved not only in the transmission, but because receivers will only recognize single-cycle waveforms, power isn't wasted on un-intended RF signals .

xMax is a mobile VoIP and data system operating in the license-free ISM 900MHz band (902-928MHz). xMax is an end-to-end Internet Protocol (IP) system infrastructure that includes a line of base stations, mobile switching centers (MSC), handsets
xMax wireless broadband 1000 times more efficient than WiMax “ and claims the technique could also make wireless LANs that will run for years on watch batteries.
The system carried 7.4 Mbit/s per MHz per Watt, said Professor Schwartz. By comparison, GSM would have around 0.0058, and CDMA/EV-DO about 0.0085 Mbit/s per MHz per Watt
see more in
http://news.techworldmobile-wireless/4722/xmax-sparks-low-power-wireless-revolution/